code: def test_retrieve_results_dtypes():
      db = {"ukbench09060.jpg": "e064ece078d7c96a"}
      result = HashEval(
          db, db, HAMMING_DISTANCE_FUNCTION
      ).retrieve_results()
      assert isinstance(result, dict)
      assert isinstance(list(result.values())[0], list)
  
file_path: imagededup/tests/test_retrieval.py
imports: import sys
  import pytest
  import numpy
  from sklearn.metrics.pairwise import cosine_similarity
  from imagededup.handlers.search.retrieval import HashEval, cosine_similarity_chunk, get_cosine_similarity
  from imagededup.methods.hashing import Hashing
label_desc: Use image node_id 4 for calling a global function with example usage: test_retrieve_results_dtypes() without return types